PI68897: CHIN ABEND 0C4-00000011 CSQXADPM WITH CSQSNAP WITH XFFSRSTMVSASYNCCONSUMERTHREAD

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• CHIN abends and goes down with the following error messages:
  
  ----------------------------------------------------------------
  +CSQX053E +CSQ1 CSQXFFST Error information recorded in CSQSNAP
            data set
  +CSQX112E +CSQ1 CSQXDISP Dispatcher process error, TCB=009C46D8
            reason=0C4000-00000011
  CSQY291E CSQXDMPS SDUMPX FAILED, RC=00000208,CSQ1,ABN=
           5C6-00E70054, LOC=CSQXADPM.CSQXADPM
  IEA794I SVC DUMP HAS CAPTURED:  680
  DUMPID=059 REQUESTED BY JOB (MQT2CHIN)
  +CSQX209E +CSQ1 CSQXRESP Connection unexpectedly terminated,
         DUMP TITLE=CSQ1,ABN= 0C4-00000011
         M=CSQXDISP,LOC=CSQXADPM.????????
         channel UYG.ESB.TO.MQ
         connection <connection> (<ipaddr>)
   (queue manager CSQ1)
   TRPTYPE=TCP RC=00000000
  ----------------------------------------------------------------
  
  CSQSNAP shows eyecatchers:
  
  ----------------------------------------------------------------
  *X...XFFSrstMVSAsyncConsumerThrea*
  *d.......MOVR.........$&#162;&X...XINS*
  *................................*
  
  and
  
  *                        ....Inva*
  *lid aCon state..ACNV............*
  *......................K.........*
  *................................*
  *............... .. ........... .*
  *.. ...{\............            *
  ----------------------------------------------------------------
  
  The initial abend, the 0C4 in CSQXADPM, has occurred as the
  cciCONV control block at 2B34FBD0 has been released by
  ccxFreeAllMpxConvMem although it has subsequently been
  referenced.
  .
  Additional keywords:
  CSQX053E CSQX112E CSQX209E
  rstMVSAsyncConsumerThread invalid acon state acnv
  ABEND0C4 ABENDS0C4 S0C4 S00C4
  

Local fix

• No Local Fix
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of IBM MQ for z/OS Version 9 Release 0             *
  * Modification 0.                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * When using conversation sharing (SHARECNV>0) with svrconn    *
  * channels, various errors and abends can occur including:     *
  *                                                              *
  *                                                              *
  * "+CSQX112E +xxxx CSQXDISP Dispatcher process error,          *
  * TCB=008CB510 reason=5C6000-00E70056"                         *
  *                                                              *
  * "+CSQX113E +xxxx CSQXDISP Dispatcher ended abnormally,       *
  * TCB=008CB510 reason=5C6000-00E70054"                         *
  *                                                              *
  * CSQX053E reporting an FFST in the CSQSNAP DD. The FFST is    *
  * written by rstMVSAsyncConsumerThread with reason "Invalid    *
  * aCon state"                                                  *
  *                                                              *
  * Abends 0C4, 0C6, 102 or 202 in module CSQXACNO               *
  *                                                              *
  * Abend 0C4 in module CSQXADPM                                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * none                                                         *
  ****************************************************************
  When a conversation ends, any handles associated with the
  conversation are deregistered with the queue manager, preventing
  them being posted, and the handle storage and conversation
  storage is freed.
  In rare cases, the handle was already posted when the
  conversation was ended, but the post had not yet been processed
  by CSQXACNO.
  
  Due to inadequate serialisation between CSQXACNO and the ending
  conversation, this led to CSQXACNO referencing the handle at
  unexpected times, or after the handle storage had been freed.
  
  Depending on exactly when CSQXACNO processed the post, and the
  state of the handle and conversation storage at that time, a
  variety of abends can occur.
  

Problem conclusion

• CSQXACNO and CSQXRSTM are updated to serialise processing more
  effectively when conversations end, preventing CSQXACNO
  accessing handles that are no longer valid.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PI55507

• APAR is sysrouted TO one or more of the following:

  UI41635

Modules/Macros

• CSQXACNO CSQXRSTM
  

Fix information

• Fixed component name

  MQ Z/OS V9

• Fixed component ID

  5655MQ900

Applicable component levels

• R000 PSY UI41635

     UP17/01/10 P F701

Fix is available

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